JP2020057825A - Base station device, terminal device, communication method, and integrated circuit - Google Patents

Abstract

To cause a base station device and a terminal device to efficiently communicate with each other.SOLUTION: A first reference signal is always arranged in a partial resource element in a resource block determined on the basis of downlink control information, it is determined whether a second reference signal is mapped a resource element on the basis of first information, and when a physical uplink shared channel is transmitted by discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped and transmitted on the basis of one or more first patterns, and when the physical uplink shared channel is transmitted by orthogonal frequency division multiplexing (OFDM), the second reference signal is mapped and transmitted on the basis of the one or more second patterns, and the one or more first patterns and the one or more second patterns are defined by the time and the position of frequency in which the second reference signals in one resource block are mapped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a base station device, a terminal device, a communication method, and an integrated circuit.

  Currently, as the wireless access method and wireless network technology for the fifth generation cellular system, the 3rd Generation Partnership Project (3GPP) has been involved in LTE (Long Term Evolution) -Advanced Pro and NR (New Radio). technology) and standard formulation (Non-Patent Document 1).

In the fifth generation cellular system, eMBB (enhanced Mobile BroadBand) realizes high-speed and large-capacity transmission, and URLLC (Ultra-Reliable and Low Latency) realizes low-delay and high-reliability communication
Communication) and mmtc (massive machine type communication) to which a number of machine-type devices such as IoT (Internet of Things) are connected are required as assumed scenarios for services.

  In NR, a reference signal for tracking phase noise generated by an oscillator has been studied in order to communicate at a high frequency. (Non-Patent Document 2).

RP-161214, NTT DOCOMO, “Revision of SI: Study on New Radio Access Technology”, June 2016 R1-1701435, Mitsubishi Electric, CATT, InterDigital, Intel, Qualcomm, “WF on PT-RS for DFTsOFDM”, January 2017

  An object of the present invention is to provide a terminal device, a base station device, a communication method, and an integrated circuit for efficiently communicating in the above wireless communication system.

  (1) In order to achieve the above object, the embodiment of the present invention has taken the following measures. That is, the terminal device according to one aspect of the present invention is a terminal device that communicates with the base station device, and includes a first reference signal, a second reference signal, and a transmission unit that transmits a physical uplink shared channel, A receiving unit that receives first information and receives a physical downlink control channel, wherein the first information is information for setting transmission of the second reference signal by the base station device, The physical uplink shared channel is transmitted based on downlink control information received by the downlink control channel, and the first reference signal is a resource block in a resource block determined based on the downlink control information. It is always allocated to some resource elements, and it is determined whether or not the second reference signal is mapped to a resource element based on the first information. When transmitting a link shared channel by discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped and transmitted based on one or more first patterns, When transmitting the physical uplink shared channel by orthogonal frequency division multiplexing (OFDM), the second reference signal is mapped and transmitted based on one or more second patterns, and the one or more And the one or more second patterns are defined by a time and frequency location that maps the second reference signal within one resource block.

  (2) Further, in the terminal device according to one aspect of the present invention, the number of resource elements that map reference signals included in the first pattern is a resource element that maps reference signals included in the second pattern. Is the same as the number.

  (3) Also, in the terminal device according to one aspect of the present invention, the number of resource elements that map reference signals included in the first pattern is equal to the number of resource elements that map reference signals included in the second pattern. Same as number.

  (4) Further, in the terminal device according to one aspect of the present invention, a wireless transmission scheme for transmitting the physical uplink shared channel is notified by the downlink control information.

  (5) Further, the base station apparatus according to one aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, wherein the transmitting section transmits first information on a physical downlink control channel, and the first reference signal , A second reference signal, and a receiving unit that receives a physical uplink shared channel, wherein the first information indicates to the terminal device whether or not to transmit the second reference signal. Information, the physical uplink shared channel is transmitted based on downlink control information received on the downlink control channel, and the first reference signal is determined based on the downlink control information It is always arranged in some resource elements in the resource block, and it is determined whether or not the second reference signal is mapped to a resource element based on the first information. When transmitting the shared channel by discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped and transmitted based on one or more first patterns, When transmitting the physical uplink shared channel by orthogonal frequency division multiplexing (OFDM), the second reference signal is mapped and transmitted based on one or more second patterns, and the one or more And the one or more second patterns are defined by a time and frequency location that maps the second reference signal within one resource block.

  ADVANTAGE OF THE INVENTION According to this invention, a base station apparatus and a terminal device can communicate efficiently.

It is a figure showing the concept of the wireless communication system in this embodiment. FIG. 2 is a diagram illustrating an example of a schematic configuration of an uplink slot in the present embodiment. FIG. 3 is a diagram showing a relationship in a time domain between subframes, slots, and minislots. FIG. 3 is a diagram illustrating an example of a slot or a subframe. FIG. 3 is a diagram illustrating an example of beam forming. FIG. 11 is a diagram illustrating a first configuration example of a PTRS mapped to one resource element. FIG. 14 is a diagram illustrating a second configuration example of the PTRS mapped to one resource element. FIG. 2 is a schematic block diagram illustrating a configuration of a terminal device 1 according to the embodiment. FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to the present embodiment. It is a figure showing an outline of the flow of the 1st processing between base station device 3 and terminal unit 1 in this embodiment. It is a figure showing an outline of the flow of the 2nd processing between base station device 3 and terminal unit 1 in this embodiment. It is a figure showing an outline of the flow of the 3rd processing between base station device 3 and terminal unit 1 in this embodiment.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is a conceptual diagram of a wireless communication system according to the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3. Hereinafter, the terminal devices 1A to 1C are also referred to as a terminal device 1.

The terminal device 1 is also called a user terminal, a mobile station device, a communication terminal, a mobile device, a terminal, a UE (User Equipment), and an MS (Mobile Station). The base station device 3 includes a radio base station device, a base station, a radio base station, a fixed station, an NB (Node B), an eNB (evolved Node B), a BTS (Base Transceiver Station), a BS (Base Station), and an NR NB ( NR Node B), NNB, T
Also called RP (Transmission and Reception Point), gNB.

  In FIG. 1, in wireless communication between the terminal device 1 and the base station device 3, orthogonal frequency division multiplexing (OFDM) including a cyclic prefix (CP) and single carrier frequency multiplexing (SC- FDM: Single-Carrier Frequency Division Multiplexing, Discrete Fourier Transform Spread OFDM (DFT-S-OFDM), and Multi-Carrier Code Division Multiplexing (MC-CDM) are used. Is also good.

  In FIG. 1, in wireless communication between the terminal device 1 and the base station device 3, a universal-filtered multi-carrier (UFMC), a filter OFDM (F-OFDM: Filtered OFDM), and a window function are used. Multiplied OFDM (Windowed OFDM) and Filter Bank Multi-Carrier (FBMC) may be used.

  In this embodiment, OFDM symbols will be described using OFDM as a transmission method, but the present invention includes a case using the above-described other transmission methods.

  In FIG. 1, the wireless communication between the terminal device 1 and the base station device 3 may use the above-described transmission method that does not use a CP or performs zero padding instead of the CP. Also, the CP and zero padding may be added to both the front and the rear.

In FIG. 1, in wireless communication between the terminal device 1 and the base station device 3, orthogonal frequency division multiplexing (OFDM) including a cyclic prefix (CP) and single carrier frequency multiplexing (SC- FDM: Single-Carrier Frequency Division Multiplexing, Discrete Fourier Transform Spread OFDM (DFT-S-OFDM: Discrete
Fourier Transform Spread OFDM and Multi-Carrier Code Division Multiplexing (MC-CDM) may be used.

  In FIG. 1, the following physical channels are used in wireless communication between the terminal device 1 and the base station device 3.

・ PBCH (Physical Broadcast CHannel)
・ PCCH (Physical Control CHannel)
・ PSCH (Physical Shared CHannel)

  The PBCH is used to broadcast an important information block (MIB: Master Information Block, EIB: Essential Information Block, BCH: Broadcast Channel) including important system information required by the terminal device 1.

The PCCH is used for transmitting uplink control information (Uplink Control Information: UCI) in the case of uplink wireless communication (wireless communication from the terminal device 1 to the base station device 3). Here, the uplink control information may include channel state information (CSI: Channel State Information) used to indicate the state of the downlink channel. Further, the uplink control information may include a scheduling request (SR: Scheduling Request) used for requesting a UL-SCH resource. The uplink control information may include HARQ-ACK (Hybrid Automatic Repeat request Acknowledgment). HARQ-ACK is downlink data (Transport block, Medium Access).
HARQ-ACK for Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH) may be indicated.

Further, in the case of downlink wireless communication (wireless communication from the base station device 3 to the terminal device 1), it is used to transmit downlink control information (Downlink Control Information: DCI). Here, one or a plurality of DCIs (which may be referred to as DCI formats) are defined for transmission of downlink control information. That is, a field for downlink control information is defined as DCI and is mapped to information bits.

  For example, DCI may be defined as DCI including information indicating whether a signal included in the scheduled PSCH is downlink wireless communication or uplink wireless communication.

  For example, a DCI including information indicating a downlink transmission period included in a scheduled PSCH may be defined as the DCI.

  For example, a DCI including information indicating an uplink transmission period included in a scheduled PSCH may be defined as the DCI.

  For example, as the DCI, a DCI including information indicating the timing of transmitting a HARQ-ACK for a scheduled PSCH (for example, the number of symbols from the last symbol included in the PSCH to the HARQ-ACK transmission) may be defined.

  For example, as the DCI, a DCI including information indicating a downlink transmission period, a gap, and an uplink transmission period included in the scheduled PSCH may be defined.

  For example, DCI used for scheduling one downlink radio communication PSCH (transmission of one downlink transport block) in one cell may be defined as DCI.

  For example, DCI used for scheduling one uplink radio communication PSCH (transmission of one uplink transport block) in one cell may be defined as DCI.

Here, the DCI includes information on PSCH scheduling when the PSCH includes an uplink or a downlink. Here, the DCI for the downlink is assigned to a downlink grant or a downlink assignment (downlink grant).
assignment). Here, DCI for the uplink is also referred to as an uplink grant or an uplink assignment.

The PSCH is used for transmitting uplink data (UL-SCH: Uplink Shared CHannel) or downlink data (DL-SCH: Downlink Shared CHannel) from medium access (MAC). In the case of the downlink, it is also used for transmitting system information (SI: System Information), a random access response (RAR: Random Access Response), and the like. In the case of the uplink, it may be used to transmit HARQ-ACK and / or CSI along with the uplink data. Also, it may be used to transmit only CSI or only HARQ-ACK and CSI. That is, it may be used to transmit only UCI.

Here, the base station device 3 and the terminal device 1 exchange (transmit and receive) signals in an upper layer. For example, the base station apparatus 3 and the terminal apparatus 1 perform RRC signaling (RRC message: Radio Resource Control) in a radio resource control (RRC: Radio Resource Control) layer.
Control message, RRC information: also referred to as Radio Resource Control information). Further, the base station device 3 and the terminal device 1 may transmit and receive MAC control elements in a MAC (Medium Access Control) layer. Where R
RC signaling and / or MAC control elements are also referred to as higher layer signaling.

The PSCH may be used for transmitting RRC signaling and MAC control elements. Here, the RRC signaling transmitted from the base station device 3 may be a common signal to a plurality of terminal devices 1 in a cell. Further, the RRC signaling transmitted from the base station device 3 may be signaling dedicated to a certain terminal device 1 (also referred to as dedicated signaling). That is, terminal device specific (
UE-specific information may be transmitted to a certain terminal device 1 using dedicated signaling. The PSCH may be used for transmission of a UE capability (UE Capability) in the uplink.

  Although the PCCH and the PSCH use the same name for the downlink and the uplink, different channels may be defined for the downlink and the uplink.

For example, the downlink shared channel may be referred to as a physical downlink shared channel (PDSCH). Also, the uplink shared channel may be referred to as a physical uplink shared channel (PUSCH). Also, the downlink control channel may be referred to as a physical downlink control channel (PDCCH). The uplink control channel may be referred to as a physical uplink control channel (PUCCH: Physical Uplink Control CHannel).

In FIG. 1, the following downlink physical signals are used in downlink wireless communication. Here, the downlink physical signal is not used for transmitting information output from the upper layer, but is used by the physical layer.
・ Synchronization signal (SS)
・ Reference Signal (RS)

  The synchronization signal may include a primary synchronization signal (PSS: Primary Synchronization Signal) and a secondary synchronization signal (SSS). The cell ID may be detected using the PSS and the SSS.

The synchronization signal is used by the terminal device 1 to synchronize the downlink frequency domain and the time domain. Here, the synchronization signal may be used by the terminal device 1 for precoding or beam selection in precoding or beamforming by the base station device 3.

  The reference signal is used by the terminal device 1 to perform channel compensation of the physical channel. Here, the reference signal may also be used by the terminal device 1 to calculate downlink CSI. In addition, the reference signal may be used for fine synchronization (fine synchronization) such that numerology such as a wireless parameter and a subcarrier interval or FFT window synchronization can be performed.

In the present embodiment, one or more of the following downlink reference signals are used.
・ DMRS (Demodulation Reference Signal)
・ CSI-RS (Channel State Information Reference Signal)
・ PTRS (Phase Tracking Reference Signal)
・ MRS (Mobility Reference Signal)

DMRS is used to demodulate a modulated signal. In the DMRS, two types of reference signals for demodulating the PBCH and a reference signal for demodulating the PSCH may be defined, or both may be referred to as DMRS. CSI-RS is used for measurement of channel state information (CSI: Channel State Information) and beam management. PTRS
Is used to track a phase shift due to movement of a terminal or the like. MRS may be used to measure reception quality from a plurality of base station devices for handover. Further, a reference signal for compensating for phase noise may be defined as the reference signal.

  A downlink physical channel and / or a downlink physical signal are collectively referred to as a downlink signal. An uplink physical channel and / or an uplink physical signal are collectively referred to as an uplink signal. The downlink physical channel and / or the uplink physical channel are collectively referred to as a physical channel. The downlink physical signal and / or the uplink physical signal are collectively referred to as a physical signal.

BCH, UL-SCH and DL-SCH are transport channels. A channel used in a medium access control (MAC) layer is called a transport channel. The unit of the transport channel used in the MAC layer is also called a transport block (TB) and / or a MAC PDU (Protocol Data Unit). In the MAC layer, HARQ (Hybrid Automatic Repeat reQuest) is controlled for each transport block. The transport block is a unit of data that the MAC layer delivers to the physical layer. In the physical layer, transport blocks are mapped to codewords, and encoding is performed for each codeword.

  Further, the reference signal may be used for radio resource measurement (RRM). Further, the reference signal may be used for beam management.

  Beam management includes analog and / or digital beams in a transmitting device (the base station device 3 in the case of downlink, and the terminal device 1 in the case of uplink) and a receiving device (the terminal device 1 in the case of downlink). (In the case of the uplink, the base station apparatus 3), the procedure of the base station apparatus 3 and / or the terminal apparatus 1 for matching the directivity of the analog and / or digital beams and obtaining the beam gain.

The beam management may include the following procedures.
・ Beam selection
・ Beam refinement
・ Beam recovery

  For example, the beam selection may be a procedure for selecting a beam in communication between the base station device 3 and the terminal device 1. Further, the beam improvement may be a procedure of selecting a beam having a higher gain or changing a beam between the base station apparatus 3 and the terminal apparatus 1 optimally by moving the terminal apparatus 1. The beam recovery may be a procedure for reselecting a beam when the quality of a communication link is degraded due to a blockage caused by a shield or the passage of a person in communication between the base station device 3 and the terminal device 1.

  For example, when selecting a transmission beam of the base station device 3 in the terminal device 1, CSI-RS may be used, or quasi co-location (QCL) assumption may be used.

  Two antenna ports are said to be QCL if the Long Term Property of the channel on which one symbol at one antenna port is carried can be inferred from the channel on which one symbol at the other antenna port is carried. . The long-range characteristics of the channel include one or more of delay spread, Doppler spread, Doppler shift, average gain, and average delay. For example, if the antenna port 1 and the antenna port 2 are QCL with respect to the average delay, it means that the reception timing of the antenna port 2 can be inferred from the reception timing of the antenna port 1.

This QCL can be extended to beam management. For this purpose, a QCL extended to the space may be newly defined. For example, as a long term property of a channel in a spatial QCL assumption, an arrival angle (AoA (Angle of Arrival), ZoA (Zenith angle of Arrival), etc.) and / or an angle spread (Angle) in a radio link or a channel. Spread, for example, ASA (Angle Spread of Arrival) and ZSA (Zenith angle Spread of Arrival), sending angle (AoD, ZoD, etc.) and its angular spread (Angle Spread, for example, ASD (Angle Spread of Departure), ZSS (Zenith angle) Spread of Departure) and Spatial Correlation.

  According to this method, the operations of the base station device 3 and the terminal device 1 equivalent to the beam management may be defined by the QCL assumption of space and the radio resources (time and / or frequency) as the beam management.

  Hereinafter, the subframe will be described. In this embodiment, it is called a subframe, but may be called a resource unit, a radio frame, a time section, a time interval, or the like.

  FIG. 2 is a diagram illustrating an example of a schematic configuration of an uplink slot according to the first embodiment of the present invention. Each of the radio frames is 10 ms long. Each radio frame is composed of 10 subframes and X slots. That is, the length of one subframe is 1 ms. Each slot has a time length defined by a subcarrier interval. For example, when the subcarrier interval of the OFDM symbol is 15 kHz and the NCP (Normal Cyclic Prefix), X = 7 or X = 14, which are 0.5 ms and 1 ms, respectively. When the subcarrier interval is 60 kHz, X = 7 or X = 14, which are 0.125 ms and 0.25 ms, respectively. FIG. 2 shows a case where X = 7 as an example. It should be noted that the same applies to the case where X = 14. Also, an uplink slot is defined similarly, and a downlink slot and an uplink slot may be defined separately.

The signal or physical channel transmitted in each of the slots may be represented by a resource grid. A resource grid is defined by multiple subcarriers and multiple OFDM symbols. The number of subcarriers forming one slot depends on the downlink and uplink bandwidth of the cell, respectively. Each of the elements in the resource grid is called a resource element. Resource elements may be identified using subcarrier numbers and OFDM symbol numbers.

A resource block is used to represent the mapping of resource elements of a certain physical downlink channel (such as PDSCH) or an uplink channel (such as PUSCH). As the resource block, a virtual resource block and a physical resource block are defined. A physical uplink channel is first mapped to a virtual resource block. Thereafter, the virtual resource blocks are mapped to physical resource blocks. In the case of NCP where the number of OFDM symbols included in the slot is X = 7, one physical resource block is defined by seven consecutive OFDM symbols in the time domain and 12 consecutive subcarriers in the frequency domain. You. That is, one physical resource block is composed of (7 × 12) resource elements. In the case of ECP (Extended CP), one physical resource block is defined by, for example, six consecutive OFDM symbols in the time domain and 12 consecutive subcarriers in the frequency domain. That is, one physical resource block is composed of (6 × 12) resource elements. At this time, one physical resource block corresponds to one slot in the time domain, and corresponds to 180 kHz (720 kHz in the case of 60 kHz) in the frequency domain when the subcarrier interval is 15 kHz. Physical resource blocks are numbered from 0 in the frequency domain.

  Next, subframes, slots, and minislots will be described. FIG. 3 is a diagram illustrating the relationship in the time domain between subframes, slots, and minislots. As shown in the figure, three types of time units are defined. The subframe is 1 ms regardless of the subcarrier interval, the number of OFDM symbols included in the slot is 7 or 14, and the slot length varies depending on the subcarrier interval. Here, when the subcarrier interval is 15 kHz, 14 OFDM symbols are included in one subframe. Therefore, assuming that the subcarrier interval is Δf (kHz), the slot length may be defined as 0.5 / (Δf / 15) ms when the number of OFDM symbols constituting one slot is seven. Here, Δf may be defined by a subcarrier interval (kHz). When the number of OFDM symbols forming one slot is 7, the slot length may be defined as 1 / (Δf / 15) ms. Here, Δf may be defined by a subcarrier interval (kHz). Further, when the number of OFDM symbols included in a slot is X, the slot length may be defined as X / 14 / (Δf / 15) ms.

  A mini-slot (which may be referred to as a sub-slot) is a time unit composed of fewer OFDM symbols than the number of OFDM symbols included in the slot. The figure shows an example where the minislot is composed of 2 OFDM symbols. An OFDM symbol in a mini-slot may coincide with the OFDM symbol timing making up the slot. The minimum unit of scheduling may be a slot or a minislot. Also,

FIG. 4 is a diagram illustrating an example of a slot or a subframe. Here, a case where the slot length is 0.5 ms at a subcarrier interval of 15 kHz is shown as an example. In the figure, D indicates downlink and U indicates uplink. As shown in the figure, within a certain time interval (for example, the minimum time interval that must be assigned to one UE in the system)
・ Downlink part (duration)
・ Gap ・ Uplink part (duration)
May be included.

4A may be referred to as a certain time section (for example, a minimum unit of a time resource that can be allocated to one UE, or a time unit. Also, a plurality of the minimum units of a time resource are bundled and called a time unit. FIG. 4B illustrates an example in which uplink scheduling is performed using, for example, PCCH in the first time resource, and the processing delay and downlink of PCCH are performed. , An uplink signal is transmitted via an uplink switching time and a gap for generating a transmission signal. FIG. 4 (c) is used for the transmission of the downlink PCCH and / or the downlink PSCH in the first time resource, through the processing delay and the switching time from the downlink to the uplink, and the gap for generating the transmission signal. Used for PSCH or PCCH transmission. Here, as an example, the uplink signal may be used for transmission of HARQ-ACK and / or CSI, that is, UCI. FIG. 4 (d) is used for transmission of the downlink PCCH and / or the downlink PSCH in the first time resource, through the processing delay and the switching time from the downlink to the uplink, and the gap for generating the transmission signal. Used for transmission of uplink PSCH and / or PCCH. Here, as an example, the uplink signal may be used for transmission of uplink data, that is, UL-SCH. FIG. 4 (e) shows an example in which all signals are used for uplink transmission (uplink PSCH or PCCH).

  The above-mentioned downlink part and uplink part may be configured by a plurality of OFDM symbols as in LTE.

  FIG. 5 is a diagram illustrating an example of beamforming. The plurality of antenna elements are connected to one transmission unit (TXRU: Transceiver unit) 10, the phase is controlled by a phase shifter 11 for each antenna element, and the transmission is performed from the antenna element 12 so that the transmission signal is transmitted in an arbitrary direction. Can direct the beam. Typically, TXRU may be defined as an antenna port, and in terminal device 1, only an antenna port may be defined. By controlling the phase shifter 11, directivity can be directed in an arbitrary direction, so that the base station apparatus 3 can communicate with the terminal apparatus 1 using a beam having a high gain.

  FIG. 6 is a diagram illustrating a first configuration example of the PTRS mapped to one resource element. In FIG. 6, portions shaded with oblique lines are resource elements to which PTRS is mapped, and other portions are resource elements to which data is mapped. In FIG. 6, FIGS. 6-1 to 6-9 are defined as patterns 1 to 9, respectively. Patterns 1 to 3 are examples in which PTRSs are successively arranged in the time direction, patterns 4 to 6 are examples in which PTRSs are arranged every other time, and patterns 7 to 9 are two in the time direction. This is an example in which every other is arranged. Note that PTRSs are not limited to FIG. 6 and may be arranged at two or more intervals in the time direction, and intervals in the frequency direction and subcarrier positions are not limited to FIG. As the PTRS, one of the patterns shown in FIG. 6 may be defined, or a plurality of patterns may be defined. In addition, the arrangement pattern of the PTRS may be set in advance as shown in FIG. 6 and the PTRS may be generated based on the pattern number, or the PTRS may be generated by specifying the position where the PTRS is arranged.

  FIG. 7 is a diagram illustrating a second configuration example of the PTRS mapped to one resource element. In FIG. 7, portions shaded with oblique lines are resource elements to which PTRS is mapped, and other portions are resource elements to which data is mapped. In FIG. 7, FIG. The pattern 10 in FIG. 7 is an example in which PTRSs are arranged every other in the time direction in the same subcarrier number as the pattern 5 in FIG. 6, but the arrangement positions of the PTRS in the fourth subcarrier from the top are different. It is an example.

Here, the terminal device 1 does not have to map the PUSCH signal to the resource element to which the PTRS is mapped. That is, if the PUSCH signal is not mapped, P
A rate match may be applied in which the resource element to which the TRS is mapped is not a resource element to which a PUSCH signal can be placed. Further, the PUSCH signal is arranged in the resource element to which the PTRS is mapped, but may be overwritten by the PTRS. In this case, the base station apparatus 3 may perform the demodulation process on the assumption that the data is arranged in the resource element in which the PTRS is arranged.

  As the PTRS, a different PTRS may be generated depending on a frequency band. Also, the number of resource elements to which PTRS is mapped is reduced in a low frequency band that is not easily affected by phase rotation, and the number of resource elements to which PTRS is mapped is increased in a high frequency band that is easily affected by phase rotation. Is also good. For example, the pattern 7 may be set when the frequency band is 4 GHz, and the pattern 2 may be set when the frequency band is 40 GHz. For example, the PTRS may be set for each frequency band. For example, PTRS may be set for each frequency band, such as setting pattern 2 when the frequency band is 4 GHz and setting pattern 3 when the frequency band is 40 GHz. For example, the PTRS may be set for each frequency band, such as setting pattern 5 when the frequency band is 4 GHz and setting pattern 2 when the frequency band is 40 GHz. As described above, in a high frequency band that is easily affected by phase rotation, the performance of phase tracking can be improved by increasing the number of resource elements to which the PTRS is mapped. Further, in a low frequency band in which the influence of the phase rotation is considered to be relatively small, by reducing the number of resource elements to which the PTRS is mapped, it is possible to reduce the overhead due to the PTRS while maintaining the performance of the phase tracking. It should be noted that PTRS may not be mapped in a frequency band in which the influence of phase rotation is not a problem among low frequency bands.

  Here, when setting the PTRS pattern, the terminal device 1 may increase the number of PTRSs in the frequency direction according to the scheduling bandwidth. For example, when the PTRS is mapped to the fifth subcarrier in one resource block, scheduling, that is, allocation is performed based on downlink control information (DCI: Downlink Control Information) transmitted on a physical downlink control channel. The number of subcarriers including PTRS on the frequency axis may increase in proportion to the number of resource blocks. Further, the number of subcarriers including the PTRS on the frequency axis in the resource block may be determined according to the frequency band. Further, the density of PTRS in the frequency direction may be set, activated, or instructed by RRC, MAC CE, or DCI. The PTRS density on the frequency axis may be defined by the number of resource elements including the PTRS included in the resource block or the number of subcarriers.

  Further, the density of the PTRS in the time direction may be determined by the frequency band. For example, when the frequency band is 4 GHz, the PTRS may be transmitted based on pattern 7, and when the frequency band is 30 GHz, the PTRS may be transmitted based on pattern 1. For example, when the frequency band is 4 GHz, the PTRS may be transmitted based on pattern 9, and when the frequency band is 30 GHz, the PTRS may be transmitted according to pattern 6. Further, the density of the PTRS in the time direction may be set, activated, or instructed by RRC, MAC, or DCI. The density on the time axis may be defined by the number of resource elements including the PTRS included in the resource block, the number of OFDM symbols in a slot, or the number of OFDM symbols in a subframe.

As the PTRS, a different PTRS may be generated depending on an MCS or a modulation scheme. When the modulation level is high, the number of resource elements to which the PTRS is mapped may be increased, and when the modulation level is low, the number of resource elements to which the PTRS is mapped may be reduced. For example, the PTRS may be set for each modulation method, such as setting pattern 3 when the modulation method is 256 QAM and setting pattern 1 when the modulation method is 16 QAM. For example, the PTRS may be set for each modulation method, such as setting pattern 1 when the modulation method is 256 QAM and setting pattern 4 when the modulation method is 16 QAM. As described above, by increasing the number of resource elements to which the PTRS is mapped when the modulation multilevel number is high, the performance of phase tracking can be improved. Also, by reducing the number of PTRSs when the number of modulation levels is low, it is possible to reduce the overhead due to the PTRSs while maintaining the performance of phase tracking. When the modulation multi-level number is low and the influence of the phase rotation is not considered to be a problem, the PTRS need not be mapped.

  The PTRS may be set for each wireless transmission scheme. The number of resource elements to which the PTRS is mapped may be set to be the same or different depending on whether the wireless transmission scheme is DFTS-OFDM or CP-OFDM. Good. For example, the same pattern may be selected for DFTS-OFDM and CP-OFDM. Also, pattern 1 may be set in the case of DFTS-OFDM, and pattern 10 may be set in the case of CP-OFDM, and the number of PTRS may be the same although the pattern is different. As described above, by making the number of resource elements to which the PTRS is mapped in the case of DFTS-OFDM equal to the number of resource elements to which the PTRS is mapped in the case of CP-OFDM, a process for generating the PTRS is performed. The burden can be equalized. Further, the number of PTRSs in the case of DFTS-OFDM may be set to be larger than the number of PTRSs in the case of CP-OFDM. For example, pattern 2 may be set for DFTS-OFDM and pattern 1 may be set for CP-OFDM, or pattern 1 may be set for DFTS-OFDM and pattern 4 for CP-OFDM. May be set. As described above, by setting the number of resource elements to which the PTRS is mapped in the case of DFTS-OFDM and the number of resource elements to which the PTRS is mapped in the case of CP-OFDM to different numbers, the characteristics of the transmission scheme can be improved. Suitable phase tracking can be set.

  In the case of DFTS-OFDM, a PTRS symbol may be inserted at a specific time position before input to the DFT. For example, when the number of PRBs mapped to resource elements in a frequency-first manner and scheduled is 4 (= 60 modulation symbols), 6, 18 (= 12 + 6) of time symbols input to the DFT when generating each DFTS-OFDM symbol. ), 30 (12 * 2 + 6) and 42 (12 * 3 + 6) th symbols may be DFT spread as PTRS. Alternatively, the data may be mapped to the resource element in a time-first manner, and a PTRS may be inserted into the first X symbol to perform DFT spreading. A PTRS may be inserted into an X symbol in a specific DFTS-OFDM symbol in a slot to perform DFT spreading. X may be the number of DFTS-OFDM symbols included in the slot. Also, the PTRS symbols may be mapped in a specific pattern before the DFT. Also, after DFT spreading, the PTRS may be placed in time and / or frequency.

  The PTRS may be set in consideration of the moving speed of the terminal device. When the moving speed is high, the number of resource elements to which the PTRS is mapped may be increased, and when the moving speed is low, the number of resource elements to which the PTRS is mapped may be reduced. For example, the pattern 3 may be set when the moving speed is high, and the pattern 7 may be set when the moving speed is low. For example, the PTRS may be set in consideration of the moving speed. For example, the pattern 3 may be set when the moving speed is high, and the pattern 1 may be set when the moving speed is low. For example, the PTRS may be set in consideration of the moving speed. For example, the pattern 2 may be set when the moving speed is high, and the pattern 8 may be set when the moving speed is low. For example, the PTRS may be set in consideration of the moving speed. Thereby, phase tracking can be appropriately performed in consideration of the moving speed.

Note that the PTRS may be set using a plurality of conditions. One or a plurality of conditions may be selected from a frequency band, a scheduling bandwidth, an MCS or a modulation method, a wireless transmission method, and / or a moving speed of a terminal device. For example, the PTRS may be set based on a wireless transmission scheme and a frequency band, or may be set based on a wireless transmission scheme, a frequency band and a modulation scheme. A PTRS pattern may be defined for each wireless transmission scheme. For example, in the case of DFTS-OFDM, a pattern 1, a pattern 2, and a pattern 3 are defined as PTRS patterns, and in the case of CP-OFDM, a pattern 4, a pattern 5, and a pattern 6 may be defined as PTRS patterns. Then, when transmission is performed by the DFTS-OFDM scheme in the 40 GHz frequency band, the PTRS may be selected from pattern 1, pattern 2, and pattern 3 based on the frequency band. Further, in the case of DFTS-OFDM, a pattern (eg, pattern 1, pattern 4 and pattern 6) in which the PTRS is arranged on the third subcarrier from the bottom in frequency position is defined, and in the case of CP-OFDM, The position may be defined to be a pattern in which the PTRS is arranged on the fifth subcarrier from the bottom.

  Note that the base station device 3 and the terminal device 1 may hold the PTRS pattern and the pattern number in advance. Further, the base station apparatus 3 may transmit the PTRS pattern number to the terminal apparatus 1 as reference signal pattern information. The terminal device 1 may generate the PTRS using the PTRS pattern held in advance and the reference signal pattern information notified from the base station device 1. Here, the reference signal pattern information is information indicating a pattern number of a PTRS defined in advance.

  Further, base station apparatus 3 may transmit reference signal arrangement information to terminal apparatus 1. Here, the reference signal arrangement information is information indicating a position where the PTRS is arranged. For example, the reference signal allocation information may be a subcarrier interval at which the PTRS is allocated (for example, continuous, every 1 subcarrier, every 2 subcarriers, etc.), a subcarrier number at which the PTRS is allocated, or It may be a symbol interval in the time direction to be arranged (for example, continuous, every other symbol, every two symbols, etc.), a symbol position in the time direction where the PTRS is arranged, or a combination thereof. For example, when the reference signal arrangement information is set to subcarrier number 3 as information in the frequency direction and continuous as information in the time direction, the pattern becomes the pattern 1 in FIG. At this time, the base station apparatus 3 notifies the terminal apparatus 1 of the information in the frequency direction and the information in the time direction as reference signal arrangement information. For example, when the information in the frequency direction is determined in advance, only the information in the time direction may be notified, or when the information in the time direction is determined, only the information in the frequency direction may be notified.

  FIG. 10 is a diagram illustrating an outline of a first processing flow between the base station device 3 and the terminal device 1 in the present embodiment. In FIG. 10, the base station device 3 determines the arrangement of the PTRS and the presence or absence of the PTRS, and instructs the terminal device 1 to the arrangement. Here, processing related to the generation of PTRS will be mainly described.

  In S101, the terminal device 1 performs uplink transmission. At this time, the terminal device 1 may transmit the UE Capability (terminal capability information) to the base station device 3 by including the phase tracking capability information. The phase tracking capability information is information indicating whether the terminal device 1 has a capability of transmitting a PTRS. For example, the phase tracking capability information may be information indicating whether the terminal device 1 has a function of mapping the PTRS or information indicating whether the terminal device 1 has a function corresponding to the NR. Further, the terminal device 1 may determine whether or not to remove the phase noise, and determine the phase tracking capability information in consideration of the result. For example, when the terminal device 1 is moving at high speed, the phase tracking capability information is set to have a capability of mapping the PTRS in order to remove the phase noise from the terminal device 1.

In S102, the base station apparatus 3 may set the phase tracking instruction information and include the phase tracking instruction information in the DCI. Here, the phase tracking instruction information is information for the base station apparatus 3 to instruct the terminal apparatus 1 whether or not to transmit a PTRS. Note that the base station apparatus 3 may set the phase tracking instruction information based on the phase tracking capability information notified from the terminal apparatus 1. For example, the phase tracking instruction information may be set to transmit the PTRS only when the phase tracking capability information indicates that the device has the capability of mapping the PTRS.

  In S103, the base station device 3 sets reference signal allocation information or reference signal pattern information. Further, base station apparatus 3 may include reference signal allocation information or reference signal pattern information in DCI.

  In S104, the base station device 3 performs downlink transmission. At this time, the information set in S102 and S103 is transmitted to the terminal device 1.

  In S105, the terminal device 1 determines the phase tracking instruction information. If it is set to transmit the PTRS in the phase tracking instruction information, the PTRS is mapped to the resource element in S106. On the other hand, if the PTRS is not set to be transmitted in the phase tracking instruction information, the PTRS is not mapped to the resource element.

  In S106, the terminal device 1 generates a PTRS based on information included in the DCI and maps the PTRS to a resource element. In addition to the information included in the DCI, information held by the terminal device may be used. For example, one or one of information from reference signal allocation information or reference signal pattern information, MCS, modulation scheme, frequency band, wireless transmission scheme, moving speed of terminal device 1 and / or information on the number of resource blocks allocated to terminal device 1 A plurality may be used.

  In S107, the terminal device 1 performs uplink transmission.

  FIG. 11 is a diagram illustrating an outline of a flow of a second process between the base station device 3 and the terminal device 1 in the present embodiment. In FIG. 11, the base station device 3 instructs the terminal device 1 only on the presence or absence of the PTRS. The base station device 3 and the terminal device 1 set a PTRS setting rule in advance, and the terminal device 1 generates a PTRS based on the held information and maps the PTRS to a resource element. Note that in FIG. 11, the same processes as those in FIG. Hereinafter, points different from FIG. 10 will be mainly described.

  In S201, the terminal device 1 determines the phase tracking instruction information. If it is set to transmit the PTRS in the phase tracking instruction information, the PTRS is mapped to the resource element in S202. On the other hand, if the PTRS is not set to be transmitted in the phase tracking instruction information, the PTRS is not mapped to the resource element.

  In S202, the terminal device 1 generates a PTRS based on a preset setting rule, and maps the PTRS to a resource element. Here, the setting rule may be determined based on information included in the DCI, or may be determined based on information held by the terminal device 1. For example, one or more of MCS, modulation scheme, frequency band, wireless transmission scheme, moving speed of terminal device 1 and / or information on the number of resource blocks allocated to terminal device 1 may be used.

FIG. 12 is a diagram showing an outline of a third processing flow between the base station device 3 and the terminal device 1 in the present embodiment. In FIG. 12, the base station device 3 does not issue an instruction regarding the presence or absence of the PTRS. Further, the base station device 3 and the terminal device 1 determine a PTRS setting rule in advance, and the terminal device 1 generates a PTRS based on the held information and maps the PTRS to a resource element. Note that, in FIG. 12, the same processes as those in FIG. 10 or FIG. Hereinafter, points different from FIGS. 10 and 11 will be mainly described.

  In S301, the base station device 3 performs downlink transmission. At this time, the phase tracking instruction information is not transmitted. The reference signal arrangement information or the reference signal pattern information may or may not be transmitted.

  In S302, the terminal device 1 generates a PTRS based on a preset setting rule and maps the PTRS to a resource element. Here, the setting rule may be determined based on information included in the DCI or the like, or may be determined based on information held by the terminal device 1. For example, information held by the terminal device 1 such as information on a frequency band, an MCS, a modulation method, a wireless transmission method, a moving speed of the terminal device 1 and / or the number of resource blocks allocated to the terminal device 1 may be used. Good. Note that the setting rule may include a condition that does not generate a PTRS. For example, when the effect of phase rotation does not matter, the PTRS may not be generated. Further, for example, when the reference signal pattern information is transmitted from the base station device 3, it may be determined that there is a phase tracking instruction, and the PTRS indicated in the reference signal pattern information may be generated.

  In FIG. 10, FIG. 11 and FIG. 12, in the terminal device 1, at least one port of the DMRS and the antenna port for transmitting the PTRS may be the same. For example, when the number of DMRS antenna ports is 2 and the number of PTRS antenna ports is 1, one of the DMRS antenna ports and the PTRS antenna port may be the same, or both may be the same. There may be. Further, QCL may be assumed for the antenna ports of the DMRS and the PTRS. For example, the frequency offset due to DMRS phase noise is inferred from the frequency offset compensated by PTRS. Also, the DMRS may always be transmitted regardless of whether the PTRS is mapped.

  The wireless transmission scheme may be set, activated, or instructed by RRC, MAC, or DCI. Thereby, the terminal device 1 may map the PTRS in consideration of the wireless transmission method notified from the base station device 3.

One aspect of the present embodiment may operate in carrier aggregation or dual connectivity with a radio access technology (RAT) such as LTE or LTE-A / LTE-A Pro. At this time, some or all cells or cell groups, carriers or carrier groups (for example, primary cell (PCell: Primary Cell), secondary cell (SCell: Secondary Cell), primary secondary cell (PSCell), MCG (Master Cell Group) ), SCG (Secondary Cell Group)
Etc.). Further, it may be used as a stand-alone that operates alone.

  Hereinafter, the configuration of the device according to the present embodiment will be described. Here, an example is shown in which CP-OFDM is applied as a downlink radio transmission scheme and CP DFTS-OFDM (SC-FDM) is applied as an uplink radio transmission scheme.

FIG. 8 is a schematic block diagram illustrating a configuration of the terminal device 1 according to the present embodiment. As illustrated, the terminal device 1 includes an upper layer processing unit 101, a control unit 103, a receiving unit 105, a transmitting unit 107, and a transmitting / receiving antenna 109. Further, the upper layer processing unit 101 is configured to include a radio resource control unit 1011, a scheduling information interpretation unit 1013, and a channel state information (CSI) report control unit 1015. The receiving unit 105 includes a decoding unit 1051, a demodulation unit 1053, a demultiplexing unit 1055, a wireless reception unit 1057, and a measurement unit 1059. Further, transmitting section 107 is configured to include coding section 1071, modulating section 1073, multiplexing section 1075, radio transmitting section 1077, and uplink reference signal generating section 1079.

The upper layer processing unit 101 outputs uplink data (transport block) generated by a user operation or the like to the transmission unit 107. The upper layer processing unit 101 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control. (Radio Resource Control: RRC) layer processing.

  The radio resource control unit 1011 included in the upper layer processing unit 101 manages various setting information of its own device. Further, the radio resource control unit 1011 generates information to be allocated to each uplink channel and outputs the information to the transmission unit 107.

  The scheduling information interpreting unit 1013 included in the upper layer processing unit 101 interprets the DCI (scheduling information) received via the receiving unit 105 and, based on the result of interpreting the DCI, determines whether the receiving unit 105 and the transmitting unit 107 It generates control information for performing control and outputs it to the control unit 103.

  CSI report control section 1015 instructs measurement section 1059 to derive channel state information (RI / PMI / CQI / CRI) related to the CSI reference resource. CSI report control section 1015 instructs transmission section 107 to transmit RI / PMI / CQI / CRI. CSI report control section 1015 sets a setting used by measurement section 1059 when calculating CQI.

  Control section 103 generates a control signal for controlling receiving section 105 and transmitting section 107 based on the control information from upper layer processing section 101. The control unit 103 outputs the generated control signal to the receiving unit 105 and the transmitting unit 107 to control the receiving unit 105 and the transmitting unit 107.

  Receiving section 105 separates, demodulates, and decodes a received signal received from base station apparatus 3 via transmission / reception antenna 109 according to the control signal input from control section 103, and outputs the decoded information to upper layer processing section 101. Output.

The radio reception unit 1057 converts a downlink signal received via the transmission / reception antenna 109 into an intermediate frequency (down conversion: down covert), removes unnecessary frequency components,
The amplification level is controlled so that the signal level is appropriately maintained, quadrature demodulation is performed based on the in-phase and quadrature components of the received signal, and the quadrature demodulated analog signal is converted into a digital signal. The radio reception unit 1057 removes a portion corresponding to a guard interval (Guard GI) from the converted digital signal, performs fast Fourier transform (Fast Fourier Transform: FFT) on the signal from which the guard interval has been removed, Extract the signal of the area.

  The demultiplexing unit 1055 separates the extracted signal into downlink PCCHs, PSCHs, and downlink reference signals. Further, the demultiplexing section 1055 compensates for the PCCH and PSCH propagation paths based on the propagation path estimation values input from the measurement section 1059. Further, demultiplexing section 1055 outputs the separated downlink reference signal to measurement section 1059.

  Demodulation section 1053 demodulates the downlink PCCH and outputs the result to decoding section 1051. Decoding section 1051 attempts to decode the PCCH, and if decoding is successful, outputs the decoded downlink control information and the RNTI corresponding to the downlink control information to upper layer processing section 101.

The demodulation unit 1053 applies QPSK (Quadrature Phase Shift Keying) to the PSCH.
, 16QAM (Quadrature Amplitude Modulation), 64QAM, 256QAM, etc., and demodulates in the modulation scheme notified by the downlink grant, and outputs it to the decoding unit 1051. Decoding section 1051 performs decoding based on the information on the transmission or the original coding rate notified by the downlink control information, and outputs the decoded downlink data (transport block) to upper layer processing section 101.

  The measurement unit 1059 performs downlink path loss measurement, channel measurement, and / or interference measurement from the downlink reference signal input from the demultiplexing unit 1055. The measurement unit 1059 outputs the CSI calculated based on the measurement result and the measurement result to the upper layer processing unit 101. Also, measuring section 1059 calculates an estimated value of the downlink propagation path from the downlink reference signal and outputs the estimated value to demultiplexing section 1055.

  Transmitting section 107 generates an uplink reference signal according to the control signal input from control section 103, encodes and modulates uplink data (transport block) input from upper layer processing section 101, and generates PUCCH, The PUSCH and the generated uplink reference signal are multiplexed and transmitted to the base station device 3 via the transmission / reception antenna 109.

  Encoding section 1071 encodes uplink control information and uplink data input from upper layer processing section 101. Modulating section 1073 modulates the coded bits input from coding section 1071 using a modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM.

  The uplink reference signal generation unit 1079 uses a physical cell identity (referred to as PCI, Cell ID, or the like) for identifying the base station device 3, a bandwidth in which the uplink reference signal is allocated, and an uplink grant. Based on the notified cyclic shift, the value of the parameter for generating the DMRS sequence, and the like, a sequence determined by a predetermined rule (expression) is generated.

  The multiplexing unit 1075 determines the number of PUSCH layers to be spatially multiplexed based on information used for PUSCH scheduling, and uses MIMO SM (Multiple Input Multiple Output Spatial Multiplexing) for the same PUSCH. A plurality of transmitted uplink data are mapped to a plurality of layers, and precoding is performed on the layers.

The multiplexing unit 1075 performs a discrete Fourier transform (Discrete Fourier Transform: DFT) on the PSCH modulation symbol according to the control signal input from the control unit 103. Multiplexing unit 1
No. 075 multiplexes the PCCH and PSCH signals and the generated uplink reference signal for each transmission antenna port. That is, multiplexing section 1075 arranges the PCCH and PSCH signals and the generated uplink reference signal in the resource element for each transmission antenna port.

The radio transmission unit 1077 converts the multiplexed signal into an inverse fast Fourier transform (Inverse Fast Fourier transform).
Transform: IFFT), performs SC-FDM modulation, adds a guard interval to the SC-FDM modulated SC-FDM symbol, generates a baseband digital signal, and converts the baseband digital signal into an analog signal. , Generate in-phase and quadrature components of the intermediate frequency from the analog signal, remove the extra frequency components for the intermediate frequency band, and convert the intermediate frequency signal to a higher frequency signal (up convert). , An extra frequency component is removed, the power is amplified, and the amplified signal is output to the transmitting / receiving antenna 109 and transmitted.

  FIG. 9 is a schematic block diagram illustrating a configuration of the base station device 3 of the present embodiment. As illustrated, the base station device 3 is configured to include an upper layer processing unit 301, a control unit 303, a reception unit 305, a transmission unit 307, and a transmission / reception antenna 309. Further, the upper layer processing unit 301 is configured to include a radio resource control unit 3011, a scheduling unit 3013, and a CSI report control unit 3015. The receiving unit 305 includes a decoding unit 3051, a demodulating unit 3053, a demultiplexing unit 3055, a wireless receiving unit 3057, and a measuring unit 3059. Also, the transmitting section 307 includes an encoding section 3071, a modulating section 3073, a multiplexing section 3075, a radio transmitting section 3077, and a downlink reference signal generating section 3079.

  The upper layer processing unit 301 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing. Further, the upper layer processing unit 301 generates control information for controlling the receiving unit 305 and the transmitting unit 307, and outputs the control information to the control unit 303.

The radio resource control unit 3011 included in the upper layer processing unit 301 generates downlink data (transport block), system information, an RRC message, a MAC CE (Control Element), etc., arranged on the downlink PSCH, or The information is acquired from the node and output to the transmission unit 307. The wireless resource control unit 3011 manages various setting information of each terminal device 1.

  The scheduling unit 3013 included in the upper layer processing unit 301 determines a frequency and a subframe to which a physical channel (PSCH) is to be allocated, a physical channel (PSCH), based on the received CSI and the estimated value of the channel and the channel quality input from the measuring unit 3059. PSCH) transmission coding rate, modulation scheme, transmission power, and the like are determined. The scheduling unit 3013 generates control information for controlling the receiving unit 305 and the transmitting unit 307 based on the scheduling result, and outputs the control information to the control unit 303. The scheduling unit 3013 generates information (for example, DCI (format)) used for physical channel (PSCH) scheduling based on the scheduling result.

  The CSI report control unit 3015 included in the upper layer processing unit 301 controls the CSI report of the terminal device 1. The CSI report control unit 3015 transmits information indicating various settings assumed by the terminal device 1 to derive RI / PMI / CQI in the CSI reference resource to the terminal device 1 via the transmission unit 307.

  The control unit 303 generates a control signal for controlling the reception unit 305 and the transmission unit 307 based on the control information from the upper layer processing unit 301. The control unit 303 outputs the generated control signal to the receiving unit 305 and the transmitting unit 307, and controls the receiving unit 305 and the transmitting unit 307.

Receiving section 305 separates, demodulates, and decodes a received signal received from terminal apparatus 1 via transmitting / receiving antenna 309 according to the control signal input from control section 303, and outputs the decoded information to upper layer processing section 301. . The radio reception unit 3057 converts an uplink signal received via the transmission / reception antenna 309 into an intermediate frequency (down conversion: down covert),
Controlling the amplification level so that unnecessary frequency components are removed and the signal level is appropriately maintained,
Quadrature demodulation is performed based on the in-phase and quadrature components of the received signal, and the quadrature demodulated analog signal is converted into a digital signal.

The wireless reception unit 3057 removes a part corresponding to a guard interval (GI) from the converted digital signal. The wireless receiving unit 3057 performs fast Fourier transform (FFT) on the signal from which the guard interval has been removed, extracts a signal in the frequency domain, and outputs the signal to the demultiplexing unit 3055.

  Demultiplexing section 1055 separates the signal input from radio receiving section 3057 into signals such as PCCH, PSCH, and uplink reference signals. This separation is performed based on the radio resource allocation information included in the uplink grant, which is determined in advance by the base station apparatus 3 in the radio resource control unit 3011 and notified to each terminal apparatus 1. Further, the demultiplexing section 3055 compensates for the PCCH and PSCH propagation paths based on the propagation path estimation values input from the measurement section 3059. Further, demultiplexing section 3055 outputs the separated uplink reference signal to measurement section 3059.

The demodulation unit 3053 performs an Inverse Discrete Fourier Transform (IDFT) on the PSCH, obtains modulation symbols, and applies BPSK (Binary Phase Shift Keying), QPSK, 16QAM, 64QAM
The terminal device 1 demodulates the received signal using a predetermined modulation method such as 256QAM or the like, or a modulation method notified by the own device to each terminal device 1 in advance by an uplink grant. Demodulation section 3053 uses MIMO SM based on the number of spatially multiplexed sequences notified in advance in the uplink grant to each terminal device 1 and information indicating precoding to be performed on the sequences, and uses the same MIMO SM. The modulation symbols of a plurality of uplink data transmitted on the PSCH are separated.

  The decoding unit 3051 transmits the demodulated coded bits of the PCCH and the PSCH to the transmission or original data of a predetermined coding scheme, which is determined in advance, or which the own apparatus has notified the terminal apparatus 1 in advance by an uplink grant. Decoding is performed at the coding rate, and the decoded uplink data and uplink control information are output to the upper layer processing unit 101. When the PSCH is retransmitted, the decoding unit 3051 performs decoding using the coded bits held in the HARQ buffer input from the upper layer processing unit 301 and the demodulated coded bits. Measuring section 309 measures an estimated value of the propagation path, channel quality, and the like from the uplink reference signal input from demultiplexing section 3055, and outputs it to demultiplexing section 3055 and upper layer processing section 301.

  The transmitting section 307 generates a downlink reference signal according to the control signal input from the control section 303, encodes and modulates downlink control information and downlink data input from the upper layer processing section 301, and performs PCCH , PSCH, and a downlink reference signal are multiplexed or transmitted using separate radio resources to the terminal device 1 via the transmission / reception antenna 309.

  The encoding unit 3071 encodes downlink control information and downlink data input from the upper layer processing unit 301. The modulation unit 3073 modulates the coded bits input from the coding unit 3071 using a modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM.

  The downlink reference signal generation unit 3079 generates a sequence known by the terminal device 1 as a downlink reference signal, which is obtained by a predetermined rule based on a physical cell identifier (PCI) for identifying the base station device 3 and the like. I do.

The multiplexing unit 3075 maps one or more downlink data transmitted on one PSCH to one or more layers according to the number of spatially multiplexed PSCH layers, and Precoding is performed on the layer of.
The multiplexing unit 375 multiplexes a downlink physical channel signal and a downlink reference signal for each transmission antenna port. The multiplexing unit 375 arranges a downlink physical channel signal and a downlink reference signal in a resource element for each transmission antenna port.

  The wireless transmission unit 3077 performs an inverse fast Fourier transform (IFFT) on the multiplexed modulation symbols and the like, performs OFDM modulation, adds a guard interval to the OFDM modulated OFDM symbol, and transmits a baseband signal. , Convert the baseband digital signal into an analog signal, generate an in-phase component and a quadrature component of the intermediate frequency from the analog signal, remove extra frequency components for the intermediate frequency band, and remove the intermediate frequency signal. Is converted into a high-frequency signal (up convert), an extra frequency component is removed, power is amplified, and the signal is output to the transmission / reception antenna 309 and transmitted.

  (1) More specifically, the terminal device 1 according to the first aspect of the present invention is a terminal device that communicates with a base station device, and includes a first reference signal, a second reference signal, and a physical uplink signal. A transmitting unit that transmits a link shared channel; and a receiving unit that receives first information and receives a physical downlink control channel, wherein the first information is transmitted by the base station apparatus to the second reference. Information for setting signal transmission, wherein the physical uplink shared channel is transmitted based on downlink control information received on the downlink control channel, and the first reference signal is the downlink control information. Is always allocated to some resource elements in the resource block determined based on the first information, and it is determined whether or not the second reference signal is mapped to the resource element based on the first information. When transmitting the physical uplink shared channel by discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped based on one or more first patterns. And transmitting the physical uplink shared channel by orthogonal frequency division multiplexing (OFDM), mapping and transmitting the second reference signal based on one or more second patterns, The one or more first patterns and the one or more second patterns are defined by a time and frequency location that maps the second reference signal within one resource block.

  (2) In the first aspect, the number of resource elements that map reference signals included in the first pattern is the same as the number of resource elements that map reference signals included in the second pattern. It is.

  (3) In the first aspect, the number of resource elements that map reference signals included in the first pattern is the same as the number of resource elements that map reference signals included in the second pattern. is there.

  (4) In the first aspect, a wireless transmission scheme for transmitting the physical uplink shared channel is notified by the downlink control information.

(5) The base station device 3 according to the second aspect of the present invention is a base station device that communicates with a terminal device, and includes a transmitting unit that transmits first information on a physical downlink control channel, and a first reference. A signal, a second reference signal, and a receiving unit that receives a physical uplink shared channel, wherein the first information indicates whether to transmit the second reference signal to the terminal device. The physical uplink shared channel is transmitted based on downlink control information received on the downlink control channel, and the first reference signal is determined based on the downlink control information. It is determined whether or not the second reference signal is mapped to a resource element based on the first information. When transmitting the shared channel by discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped and transmitted based on one or more first patterns, When transmitting the physical uplink shared channel by orthogonal frequency division multiplexing (OFDM), the second reference signal is mapped and transmitted based on one or more second patterns, and the one or more And the one or more second patterns are defined by a time and frequency location that maps the second reference signal within one resource block.

  The program that operates on the device according to the present invention may be a program that controls a Central Processing Unit (CPU) or the like to cause a computer to function so as to realize the functions of the embodiment according to the present invention. The program or information handled by the program is temporarily stored in a volatile memory such as a Random Access Memory (RAM), a non-volatile memory such as a flash memory, a Hard Disk Drive (HDD), or another storage device system.

  Note that a program for implementing the functions of the embodiment according to the present invention may be recorded on a computer-readable recording medium. The program may be realized by causing a computer system to read and execute the program recorded on the recording medium. Here, the “computer system” is a computer system built in the device, and includes an operating system and hardware such as peripheral devices. The “computer-readable recording medium” is a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a medium for dynamically storing a program for a short time, or another recording medium readable by a computer. Is also good.

  Further, each functional block or various features of the device used in the above-described embodiment may be implemented or executed by an electric circuit, for example, an integrated circuit or a plurality of integrated circuits. An electrical circuit designed to perform the functions described herein may be a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other Logic devices, discrete gate or transistor logic, discrete hardware components, or a combination thereof. A general purpose processor may be a microprocessor, or may be a conventional processor, controller, microcontroller, or state machine. The above-described electric circuit may be configured by a digital circuit or an analog circuit. In addition, in the case where a technology for forming an integrated circuit that substitutes for a current integrated circuit appears due to the progress of semiconductor technology, one or more aspects of the present invention can use a new integrated circuit based on the technology.

    In the embodiment according to the present invention, an example in which the present invention is applied to a communication system including a base station device and a terminal device has been described. However, in a system in which terminals communicate with each other, such as D2D (Device to Device). Is also applicable.

  Note that the present invention is not limited to the above embodiment. In the embodiment, an example of the device is described. However, the present invention is not limited to this, and stationary or non-movable electronic devices installed indoors and outdoors, for example, AV devices, kitchen devices, It can be applied to terminal devices or communication devices such as cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other living equipment.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes a design change or the like without departing from the gist of the present invention. Further, the present invention can be variously modified within the scope shown in the claims, and the technical scope of the present invention includes embodiments obtained by appropriately combining technical means disclosed in different embodiments. It is. The elements described in each of the above embodiments also include a configuration in which elements having the same effects are replaced with each other.

1 (1A, 1B, 1C) Terminal device 3 Base station device 10 TXRU
11 Phase shifter 12 Antenna 101 Upper layer processing unit 103 Control unit 105 Receiving unit 107 Transmitting unit 109 Antenna 301 Upper layer processing unit 303 Control unit 305 Receiving unit 307 Transmitting unit 1013 Scheduling information interpreting unit 1015 Channel state information report control unit 1051 Decoding Unit 1053 Decoding unit 1055 Demultiplexing unit 1057 Wireless receiving unit 1059 Measurement unit 1071 Encoding unit 1073 Modulating unit 1075 Multiplexing unit 1077 Wireless transmitting unit 1079 Uplink reference signal generating unit 3011 Wireless resource control unit 3013 Scheduling unit 3015 Channel state information report control Unit 3051 Decoding unit 3053 Decoding unit 3055 Demultiplexing unit 3057 Wireless receiving unit 3059 Measurement unit 3071 Encoding unit 3073 Modulating unit 3075 Multiplexing unit 3077 Wireless transmitting unit 3079 Downlink reference signal Generating unit

Claims (5)

A terminal device that communicates with a base station device,
A first reference signal, a second reference signal, and a transmission unit that transmits a physical uplink shared channel;
A receiving unit that receives the first information and receives the physical downlink control channel;
With
The first information is information for setting the transmission of the second reference signal by the base station device,
The physical uplink shared channel is transmitted based on downlink control information received by the downlink control channel,
The first reference signal is always arranged in some resource elements in a resource block determined based on the downlink control information,
It is determined whether the second reference signal is mapped to a resource element based on the first information,
When transmitting the physical uplink shared channel by discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped based on one or a plurality of first patterns. Send,
When transmitting the physical uplink shared channel by orthogonal frequency division multiplexing (OFDM), map and transmit the second reference signal based on one or more second patterns,
The one or more first patterns and the one or more second patterns are defined by a time and frequency location that maps the second reference signal within one resource block;
Terminal device. The number of resource elements that map reference signals included in the first pattern is the same as the number of resource elements that map reference signals included in the second pattern.
The terminal device according to claim 1. The one or more first patterns and the one or more second patterns are one selected based on a frequency band.
The terminal device according to claim 1. The wireless transmission scheme for transmitting the physical uplink shared channel is notified by the downlink control information,
The terminal device according to claim 1. A base station device communicating with the terminal device,
A transmitting unit for transmitting the first information on the physical downlink control channel;
A receiving unit that receives a first reference signal, a second reference signal, and a physical uplink shared channel;
With
The first information is information for instructing whether to transmit the second reference signal to the terminal device,
The physical uplink shared channel is transmitted based on downlink control information received by the downlink control channel,
The first reference signal is always arranged in some resource elements in a resource block determined based on the downlink control information,
It is determined whether the second reference signal is mapped to a resource element based on the first information,
When transmitting the physical uplink shared channel by discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S-OFDM), the second reference signal is mapped based on one or a plurality of first patterns. Send,
When transmitting the physical uplink shared channel by orthogonal frequency division multiplexing (OFDM), map and transmit the second reference signal based on one or more second patterns,
The one or more first patterns and the one or more second patterns are defined by a time and frequency location that maps the second reference signal within one resource block;
Base station device.

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